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发明名称
Visible multiple signal index card and system
摘要
申请公布号
US1996110(A)
申请公布日期
1935.04.02
申请号
US19330703160
申请日期
1933.12.20
申请人
HOLLAND HORACE B
发明人
HOLLAND HORACE B.
分类号
B42F17/00
主分类号
B42F17/00
代理机构
代理人
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地址
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